<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
				.a{
					width: 100px;
				}
				
				.b{
					height: 200px;
				}
					
				.c{
					background: red;
				}
		</style>
	</head>
	<body>
		<div class="a b c"></div>
	</body>
</html>
